<!DOCTYPE html>
<html>
<head>
	<title></title>
	<style type="text/css">
		#big{
			width:100px;
			height: 1500px;
			background-color: red;
		}
		#fix{
			position: fixed;
			right: 50px;
			bottom: 0px;
			background-color: blue;
			width: 100px;
			height:  100px;
		}

	</style>
</head>
<body>
	<div id='big'></div>
	<div id='fix'></div>

</body>
</html>